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  4. Multiphase lattice Boltzmann modeling of cyclic water retention behavior in unsaturated sand based on X-ray computed tomography
 
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Multiphase lattice Boltzmann modeling of cyclic water retention behavior in unsaturated sand based on X-ray computed tomography

Publikationstyp
Journal Article
Date Issued
2023-09
Sprache
English
Author(s)
Wang, Qiuyu  
Milatz, Marius  orcid-logo
Geotechnik und Baubetrieb B-5  
Hosseini, Reihaneh  
Kumar, Krishna
TORE-URI
https://hdl.handle.net/11420/43866
Journal
Canadian Geotechnical Journal  
Volume
60
Issue
9
Start Page
1429
End Page
1446
Citation
Canadian Geotechnical Journal 60 (9): 1429-1446 (2023-09)
Publisher DOI
10.1139/cgj-2022-0489
Scopus ID
2-s2.0-85172686822
The water retention curve (WRC) defines the relationship between matric suction and saturation and is a key function for determining the hydro-mechanical behavior of unsaturated soils. We investigate possible microscopic origins of the water retention behavior of granular soils using both computed tomography (CT) experiment and multiphase lattice Boltzmann Method (LBM). We conduct a CT experiment on Hamburg sand to obtain its WRC and then run LBM simulations based on the CT grain skeleton. The multiphase LBM simulations capture the hysteresis and pore-scale behaviors of WRC observed in the CT experiment. Using LBM, we observe that the spatial distribution and morphology of gas clusters varies between drainage and imbibition paths and is the underlying source of the hysteresis. During drainage, gas clusters congregate at the grain surface; the local suction increases when gas clusters enter through small pore openings and decreases when gas clusters enter through large pore openings. Whereas, during imbibition, gas clusters disperse in the liquid, the local suction decreases uniformly. Large pores empty first during drainage and small pores fill first during imbibition. The pore-based WRC shows that an increase in pore size causes a decrease in suction during drainage and imbibition, and an increase in hysteresis.
Subjects
multiphase lattice Boltzmann Method
unsaturated granular soils
water retention behavior
X-ray computed tomography
DDC Class
690: Building, Construction
Funding(s)
Graduiertenkolleg 2462: Prozesse in natürlichen und technischen Partikel-Fluid-Systemen  
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